from flask import render_template, current_app, session, g, abort, request, jsonify
from sqlalchemy.sql.functions import user

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu

# 127.0.0.1:5000/news/2
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/followed_user', methods=["POST"])
@user_login_data
def followed_user():
    """关注或者取消关注用户"""

    # 0. 取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="未登录")

    # 1. 取参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")

    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 2. 判断参数
    if action not in ("follow", "unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not other:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # 4. 根据要执行的操作去修改对应的数据
    if action == "follow":
        if other not in user.followed:
            # 当前用户的关注列表添加一个值
            # 禁止登录用户去关注自己,否则做出相应前端提示
            if other.id != user.id:
                user.followed.append(other)
            else:
                return jsonify(errno=RET.FOLLOWEERR, errmsg="自己不能关注自己")
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户已被关注")
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户未被关注")

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 取到请求参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2. 判断参数
    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter_by(comment_id=comment_id, user_id=g.user.id).first()
        # comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
        #                                               CommentLike.comment_id == comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            # 更新点赞次数
            comment.like_count += 1
    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter_by(comment_id=comment_id, user_id=g.user.id).first()
        # comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
        #                                               CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            # comment_like_model.delete()
            db.session.delete(comment_like_model)
            # 更新点赞次数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)  # 日志先记录错误e,再执行撤回数据库操作
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK, errmsg="OK")


@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")  # 可传(评论新闻),可不传(回复别人评论)
    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 3.初始化一个评论模型,并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到评论数据库
    # 为什么要自己手动去commit()?,因为return之前需要用到comment的id ==>当回复别人评论时,需要parent_id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)

    # 返回data数据,是为了显示前端所需的评论者头像,nick_name,content,create_time;不然只有news_id & comment content
    return jsonify(errno=RET.OK, essmsg="OK", data=comment.to_dict())


@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def news_collect():
    """
    收藏新闻
    1. 接受参数
    2. 校验参数
    3. 查询新闻,并判断新闻是否存在
    :return:
    """

    # 1. 接受参数
    user = g.user
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 2. 校验参数
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    if not news_id:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ['collect', 'cancel_collect']:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 查询新闻, 并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 4. 收藏以及取消收藏
    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        # 收藏
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="保存失败")

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :params news_id
    :return:
    """
    # 查询用户登录信息
    user = g.user

    # 右侧新闻排行逻辑,原始SQL语句
    # SELECT info_news.create_time AS info_news_create_time, info_news.update_time AS info_news_update_time,
    # info_news.id AS info_news_id, info_news.title AS info_news_title, info_news.source AS info_news_source,
    # info_news.digest AS info_news_digest, info_news.content AS info_news_content, info_news.clicks AS info_news_clicks,
    # info_news.index_image_url AS info_news_index_image_url, info_news.category_id AS info_news_category_id,
    # info_news.user_id AS info_news_user_id, info_news.status AS info_news_status, info_news.reason AS info_news_reason
    # FROM info_news ORDER BY info_news.clicks DESC LIMIT 10
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空的字典列表,里面装的就是字典
    news_dict_li = []
    # 遍历对象列表,将对象的字典添加到字典列表中
    for news in news_list if news_list else []:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        abort(404)

    if not news:
        # 报404错误,后续统一处理此类错误
        abort(404)

    # 更新新闻的点击排行次数
    news.clicks += 1

    # 是否是收藏
    is_collected = False

    # if 用户已登录:
    #     判断用户是否收藏当前新闻,如果收藏:
    #         is_collected =True

    if user:
        # 判断用户是否收藏当前新闻,如果收藏:
        # collection_news后面可以不用加all,因为sqlalchemy会在使用的时候自动加载
        if news in user.collection_news:
            is_collected = True

    # 获取当前新闻的评论;查询当前新闻的评论数据原始SQL
    # SELECT info_comment.create_time AS info_comment_create_time, info_comment.update_time AS info_comment_update_time,
    # info_comment.id AS info_comment_id, info_comment.user_id AS info_comment_user_id,
    # info_comment.news_id AS info_comment_news_id, info_comment.content AS info_comment_content,
    # info_comment.parent_id AS info_comment_parent_id, info_comment.like_count AS info_comment_like_count FROM info_comment
    # WHERE info_comment.news_id = 2459 ORDER BY info_comment.create_time DESC
    comments = []  # obj_list [obj_comment1, obj_comment2, obj_comment3...]
    try:
        # comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
        comments = Comment.query.filter_by(news_id=news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
    comment_like_ids = []
    if user:
        try:
            # 需求:查询当前用户在当前新闻里都点赞了哪些评论
            # 1.查询出当前新闻的所有评论([COMMENT])取到所有的评论id [1,2,3,4,5]
            comment_ids = [comment.id for comment in comments]
            # 2.再查询当前评论中哪些评论出被当前用户点赞 [CommentLike] 查询comment_id 在第1步列表内的所有数据 & CommentList.user_id = user.id
            if len(comment_ids) > 0:
                comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                         CommentLike.user_id == user.id).all()
                # 3.取到所有被点赞的评论id 第2步查询出来是一个[CommentLike]  ---> [3,5]
                comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []

    for comment in comments if comments else []:
        comment_dict = comment.to_dict()
        comment_dict['is_like'] = False
        if user and comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # if当前新闻有作者,并且当前登录用户已关注过这个用户
    if news.user and user:
        if news.user in user.followed:
        # if news.user.followers.filter(user.id == user.id).count() > 0:
            is_followed = True

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li,
        "is_followed": is_followed
    }

    return render_template("news/detail.html", data=data)
